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Diagnostic Tests

Non-contact optical examination that measures the different ocular structures, is an essential study for calculating the power of intraocular lenses in patients who will undergo cataract surgery.

The exam is taken with the patient seated, supporting the forehead and chin to the team. The patient fixes a red light through which the team takes the different measurements, the duration of the exam is approximately 10 minutes and it is not necessary to dilate the patient’s pupil.

The equipment used to perform this test is the lenstar optical biometer and the alcon immersion biometric ruler .

Non-invasive functional exploration test of visual field sensitivity. It is essential to perform it in patients with glaucoma or suspected of having this disease, since the progressive loss of nerve fibers of the optic nerve results in the loss of certain areas of the visual field. It is also frequently used in many neuro-ophthalmological diseases.

The function of the visual field examination is to discover these blind areas, locate them and measure their extent.

  1. Fasting is not required.
  2. The patient must not be dilated.
  3. If you wear glasses, it is essential to bring your optical correction formula.
  4. It is ideal to take the exam in the morning hours.

The intraocular pressure curve is a support test in the diagnosis and follow-up of patients with glaucoma. Without it, the peaks in ocular pressure that cause damage to the optic nerve in glaucoma could easily be overlooked. What we are looking for with the test is to identify intraocular pressure variations and peaks, as well as to measure the corneal hysteresis factor (CH) which is altered in patients with this disease.

To carry out the exam we use the ocular response analyzer (ORA), intraocular pressure measurements are taken from 7:00 am to 12 pm with 30-minute intervals. The patient does not need to fast and if any drops are applied to the eyes, they should do so normally.

Ocular ultrasound or ocular ultrasound is an imaging test in which the inside of the eye can be seen, even if media opacity (very advanced cataract, ocular hemorrhage, corneal opacity) does not allow its visualization.

Ultrasonography uses ultrasound to obtain an image of the ocular structure.

With this test, digital images of the retina are obtained, in most cases without the need to cause dilation of the pupil with mydriatic agents. Through these images, ocular structures such as the retina, the macula, and the optic nerve can be evaluated.

Autofluorescence photography (FAF) mode provides information about some retinal changes that are not visible with standard color photography.

Procedure in which, by means of a photograph, it is possible to count the cells in the corneal endothelium per square millimeter, analyze their number and shape.
This test is performed to assess the function of the corneal endothelial pump in patients undergoing cataract surgery and in contact lens wearers. It is performed with the Konan specular microscope.

Optical Coherent Tomography (OCT) is a test that provides non-invasive scanner-type images, using light waves to take pictures of different structures of the eye, such as the macula, the optic nerve and the cornea.

Through macula OCT, each of the retinal layers can be observed, allowing the ophthalmologist to see the characteristics and measure their thickness. These measurements help early detection of retinal diseases, their diagnosis, and guide treatment, including age-related macular degeneration, diabetic retinopathy, and macular hole.

Optic nerve OCT: It is an objective study of the optic nerve head and the nerve fiber layer. The information obtained from the exam, together with the clinical assessment and the correlation with other diagnostic tests, as well as the follow-up over time, is very useful for making an early diagnosis of glaucoma and monitoring glaucomatous damage. 

The Pentacam is a scheimpflug-type camera that captures images of the anterior segment of the eye, providing information from the anterior corneal surface to the posterior lens capsule.

With this information you can see characteristics of the cornea such as elevation, thickness, power distribution; which are of great importance in patients who want to be operated with excimer laser to correct defects such as myopia, hyperopia, astigmatism or patients who are going to have intraocular lenses implanted.

Test to assess the ability of the visual system to discriminate an object from the background in which it is located. For example, it is not the same to sew with black thread on a white fabric than on a black fabric.